Release of v0.12.0

[kopernic-pl]

This pull request updates the README.md documentation for the SwaggerHub CLI. The main changes include the addition of documentation for the new swaggerhub api:rename command, improvements to command usage formatting, and updates to code reference links to reflect the latest CLI release and plugin versions.

New command documentation:

• Added documentation for the new swaggerhub api:rename command, including usage, arguments, flags, description, and example. [1] [2]

Command usage and formatting improvements:

• Standardized the usage formatting for swaggerhub spectral:download and swaggerhub spectral:upload commands by capitalizing the DIRECTORY argument for consistency.

Reference and version updates:

• Updated all code reference links for CLI commands (such as api:create, api:delete, domain:create, etc.) from version v0.9.1 to v0.12.0 to reflect the latest release. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23]
• Updated code reference links for oclif plugin commands to point to the latest plugin versions (e.g., plugin-help from v6.0.22 to 6.3.0, plugin-plugins from v5.4.25 to 5.5.2). [1] [2] [3] [4] [5] [6] [7]